Door2Day: a home services marketplace running in Spain and Sweden

Stack: Next.js · NestJS · Flutter · PostgreSQL · Stripe Connect · AWS

Door2Day connects households with vetted service providers across Spain and Sweden. NextGen delivers and operates the full platform: the customer-facing web app, the customer and provider mobile apps, and the backend.

The hard problems we solved

• Marketplace payments with Stripe Connect — provider onboarding, EU KYC requirements, and payout flows across two countries, including the payment edge cases (like extra-time requests mid-job) that only surface in production.
• Three-language localization — Spanish, Swedish, and English across the web app, both mobile apps, and legal content, with a translation pipeline that keeps all surfaces in sync.
• Production database performance — diagnosing and resolving PostgreSQL bottlenecks under real load, including ORM over-fetching patterns.

The result

A marketplace serving two EU markets, operated continuously by the same team that built it — releases, monitoring, and payment operations included.

What this has to do with your app

The PostgreSQL bottlenecks, the mid-job payment edge cases and the three-language sync problems above all appeared after launch, under real users. None of them show up in a demo. That gap — between "it works" and "it holds up" — is what our Production-Readiness Audit is built to find before your customers do, whether the app was built by us, by a previous team, or with AI tools.

(TODO: add real screenshots, metrics you're allowed to share, and a client quote.)